Update Marlin/Configuration.h

Marlin/Configuration.h

 // -2 is thermocouple with MAX6675 (only for sensor 0)
 // -1 is thermocouple with AD595
 // 0 is not used
-// 1 is 100k thermistor
+// 1 is 100k thermistor - closer to EPCOS 100k manuf table
 // 2 is 200k thermistor
 // 3 is mendel-parts thermistor
 // 4 is 10k thermistor !! do not use it for a hotend. It gives bad resolution at high temp. !!
 // 5 is ParCan supplied 104GT-2 100K
-// 6 is EPCOS 100k
+// 6 is EPCOS 100k - Not calculated like table 1, measured using a fluke
 // 7 is 100k Honeywell thermistor 135-104LAG-J01
 
 #define TEMP_SENSOR_0 -1